the taliban claims the guard, who was also killed, was working for them. >> top lawmakers going back to the white house this afternoon for another round of tense debt talks. republicans still refusing to accept a deal with any tax hikes in it and the president is warning there won't be enough money to cover social security checks if they don't raise the debt ceiling by august 2nd. ♪ ♪ rocket man ♪ rocket man ♪ i'm burning out >> good morning, "atlantis." the crew of the final shuttle mission woke up to a fitting tune this morning, elton john's "rocket man." crews will spend most of the day transferring equipment and supplies to the international space station. astronauts completed the final spacewalk of the shuttle era yesterday. the 160th spacewalk devoted to building and plain take the international space station yao back to our top story, the debt talks. president obama and lawmakers from both parties will meet to try to hammer out a deal to raising the nation's debt ceiling. republican leaders have refused to consider any tax hikes and the president says if there's no dea